Simulating in Simulink - 2022.2 English

Vitis Model Composer User Guide (UG1483)

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2022.2 English

Simulink can interactively simulate your model, and view the results on scopes and graphical displays. The Simulink model defines what data to input at the start of simulation, and defines what data to capture during simulation.

When defining the model, you define the input and output signals for the model. Input signals load data into the model for simulation, while output signals allow you to record simulation results. The kind of data you want to load impacts your choice of signal loading techniques. You can define input data as constant values, use source blocks, such as the Sine Wave block, import data from a spreadsheet, or use the output of a previous simulation. Refer to Prepare Model Inputs and Outputs in the Simulink documentation for more information on preparing for simulation in Simulink.

After the simulation is completed, you can analyze any logged data with MATLAB scripts and visualization tools like the Simulation Data Inspector within the MathWorks environment.

When you enable the Create and execute testbench check box, as discussed in Vitis Model Composer Hub, Model Composer performs two tasks:

  1. Automatically logs the test data, or stimulus, at the input of your design, and the simulation results as test vectors for later use as "golden" data for comparison during C/C++ and RTL co-simulation. This file is named signals.stim, and is added to the specified Code Directory when generating output.
  2. Executes the generated test bench and verifies equivalence of the code using C-simulation and C/RTL co-simulation. This process is compute intensive, and can take considerable time.
Important: If the model simulation time in Simulink is long, with significant amounts of data processed, the test bench execution will take an even longer time. Model Composer will generate an error if the simulation time becomes infinite.